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Kim, Bumjoon
원자제어 저차원 전자계 연구단
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Optical magnons with dominant bond-directional exchange interactions in the honeycomb lattice iridate alpha-Li2IrO3

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Title
Optical magnons with dominant bond-directional exchange interactions in the honeycomb lattice iridate alpha-Li2IrO3
Author(s)
Chun, Sae Hwan; Stavropoulos, P. Peter; Kee, Hae-Young; Sala, M. Moretti; Kim, Jungho; Kim, Jong-Woo; Kim, Bumjoon; Mitchell, J. F.; Kim, Young-June
Publication Date
2021-01
Journal
PHYSICAL REVIEW B, v.103, no.2
Publisher
AMER PHYSICAL SOC
Abstract
We have used resonant inelastic x-ray scattering to reveal optical magnons in a honeycomb lattice iridate alpha-Li2IrO3. The spectrum in the energy region 20-25 meV exhibits momentum dependence, of which energy is highest at the location of the magnetic Bragg peak, (h, k) = (+/- 0.32, 0), and lowered toward (0, 0) and (+/- 1, 0). We compare our data with a linear spin-wave theory based on a generic nearest-neighbor spin model. We find that a dominant bond-directional Kitaev interaction of order 20 meV is required to explain the energy scale observed in our study. The observed excitations are understood as stemming from optical magnon modes whose intensity is modulated by a structure factor, resulting in the apparent momentum dependence. We also observed diffuse magnetic scattering arising from the short-range magnetic correlation well above T-N. In contrast to Na2IrO3, this diffuse scattering lacks the C-3 rotational symmetry of the honeycomb lattice, suggesting that the bond anisotropy is far from negligible in alpha-Li2IrO3.
URI
https://pr.ibs.re.kr/handle/8788114/9522
DOI
10.1103/PhysRevB.103.L020410
ISSN
2469-9950
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
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